Development of Molecular Markers for Specific Detection of Xanthomonas campestris pv. incanae

Xanthomonas campestris pv. incanae (Xci) is the causal agent of bacterial blight disease in ornamental crucifers. We compared the whole genomes of closely related Xanthomonas campestris pv. campestris, incanae, raphani and four other species of Xanthomonas following comparative genomics approach. We found 82 singletons out of 4024 Xci genes upon comparison. Out of 82 singletons, top 10 were selected for designing Xci specific marker. Five primers; XCI_1F/R, XCI_2F/R, XCI_3F/R, XCI_5F/R and XCI_6F/R produced amplicons of 495 bp, 503 bp, 612 bp, 665 bp and 468 bp, respectively expected to detect Xanthomonas campestris pv. incanae (Xci). In conclusion, five effective markers were developed for the detection of Xci pathogen by whole genome alignment, which could be served as effective tools in seed quarantine.